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Jurnal Vokasi Mekanika
Published by Universitas Negeri Padang
ISSN : 26561697     EISSN : 26562812     DOI : https://doi.org/10.24036/vomek.v4i3
Core Subject : Education, Engineering,
Education Mechanical Engineering
Jurnal Vokasi Mekanika menyambut baik kiriman yang memberikan wawasan tentang isu-isu terkini dan utama yang berkaitan dengan pendidikan kejuruan dan teknologi serta ilmu Keteknikan dalam bidang Teknik Mesin. Jurnal ini menyediakan tempat bagi para peneliti dan praktisi untuk mendiskusikan, mengejar, dan mempromosikan pengetahuan di bidang studi pendidikan teknologi kejuruan dan ilmu Keteknikan dalam bidang Teknik Mesin yang sedang berkembang pada saat sekarang ini. Bahasa naskah ditulis dalam bahasa Indonesia. Harus ada diskusi kritis tentang isu-isu baru dan signifikan dan kontribusi ke bidang terkait. Artikel dapat berasal dari salah satu bidang berikut: Teori, Strategi, Pendekatan, Metode Atau Model Pembelajaran TVET Penerapan dan Pengembangan Media, Modul, Bahan Ajar dan Buku Ajar Manajemen dan Kebijakan TVET Pengembangan Kurikulum TVET Evaluasi Program dan Pembelajaran TVET Penerapan Teknologi Kejuruan Terkait TVET Pengembangan Profesionalitas Guru TVET Energi dan energi terbarukan Sistem produksi dan Manufaktur Rekayasa bahan Teori dan aplikasi dinamika fluida komputasi Ilmu ilmu Teknik Mesin Lainnya.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 437 Documents
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Optimization of Laser Cutting Parameters toward Formation of Dross Defects on Stainless Steel Material Imam Qulugqin Azhim; Rifelino; Syahril; Zainal Abadi
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 3 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/w7y55g34

Abstract

Laser cutting technology is widely used in the manufacturing industry because it is able to produce precise and efficient cutting. However, improper setting of cutting parameters can cause the formation of dross defects that reduce the quality of the cut. This research aims to analyze the formation of dross defects and determine the optimal cutting parameters on stainless steel materials with a thickness of 1 mm and a cutting length of 50 mm. The full factorial experimental design is used with three process parameters, namely cutting speed (S), focus point (F), and gas pressure (P). The height of the cutting results is measured and analyzed using the Analysis of Variance (ANOVA) method to evaluate the effect of each parameter on the observed response. The analysis results show that the focus point factor (F) has a significant effect on the dross height with a p-value of 0.029 (<0.05), while cutting speed, gas pressure, and all interactions between factors do not show a statistically significant effect. Contribution analysis shows that the F×P interaction gives the greatest contribution to the dross height variation of 29%, followed by the F factor of 27%. Based on the research results, the combination of optimal parameters to minimize the height of the dross was obtained at the focus point -2 mm, cutting speed 30 m/min, and gas pressure 10 bar. This finding shows that focus point setting is the main factor in controlling dross defects in the laser cutting process of stainless steel materials.
Welding Defect Analysis in Low Carbon Steel SMAW Joints Using Visual Inspection and Liquid Penetrant Test as a Basis for Welding Quality Control Junil Adri; Durain Parmanoan; Andril Arafat; Fadhilah
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 3 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/znkhtk87

Abstract

This research is motivated by the importance of the ability of D3 Mechanical Engineering students in evaluating the quality of welded joints, because the welding results that appear unified are not necessarily free from surface defects. This study aims to analyze the types of welding defects in low carbon steel Shielded Metal Arc Welding  joints using Visual Inspection and Liquid Penetrant Test as the basis for welding quality control in vocational learning. The study used a quantitative descriptive design based on applied laboratories involving 48 D3 Mechanical Engineering students divided into three learning sessions. Each student produced one welded joint specimen, so that the total number of specimens analyzed was 48. Data were collected through visual inspection sheets, Liquid Penetrant Test result sheets, photo documentation, and recapitulation of welding defects, then analyzed using frequency, percentage, and technical interpretation of the causes of defects. The results showed that the most dominant defects were porosity with 17 specimens (35.42%), followed by undercut with 14 specimens (29.17%), excessive spatter with 12 specimens (25.00%), and irregular bead with 11 specimens (22.92%). Liquid Penetrant Test detected 64 defect indications, higher than Visual Inspection which detected 49 defect indications. From the quality category, 24 specimens were accepted, 18 required repair, and 6 were rejected. This study concluded that the combination of Visual Inspection and Liquid Penetrant Test is effective for identifying welding defects more comprehensively and can be the basis for quality control of welding learning that is more objective, systematic, and relevant to industrial needs.
The Influence of Fuel Injection Pressure on Engine Performance and Smoke Emissions in a Diesel Engine Using Palm Oil Biodiesel Blend Fuel Irlido Irwansyah; Dori Yuvenda; Yolli Fernanda; Durain Parmanoan
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 3 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/sqkbmp02

Abstract

This study was conducted to examine the effect of fuel injection pressure variations on diesel engine performance and Smoke Emissions in Yanmar TF105MR-DI diesel engines using B50 palm oil biodiesel mixture. The test was conducted at injection pressures of 210, 220, 230, and 240 kg/cm² with load variations of 1000, 2000, 3000, and 4000 W. Parameters observed included power, torque, Specific Fuel Consumption (SFC), thermal efficiency, and exhaust gas turbidity level as indicators of Smoke Emissions. The test results show that the change in injection pressure has an effect on the combustion process and the performance characteristics of the engine. An increase in injection pressure to 230 kg/cm² is able to improve the fuel atomization process so that the formation of the air-fuel mixture becomes more homogeneous. This results in higher power and torque than other pressure variations, along with a decrease in SFC values and increased thermal efficiency at all levels of load. However, when the injection pressure is increased to 240 kg/cm², the performance of the engine tends to decrease. This is suspected to be caused by the penetration of the fuel spray too far so that the mixing and combustion process does not take place optimally. In terms of emissions, a more optimal injection pressure also contributes to a reduction in the turbidity level of exhaust fumes. 
Analysis of Electrical Energy Consumption and Savings Potential at PT. Sawitech Manufacturing Workshop Through Energy Audit Method Erik Ardinata; Dori Yuvenda; Arwizet K; Andre Kurniawan
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 3 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/tj50w131

Abstract

This study aims to analyze the electrical energy consumption profile at PT. Sawitech manufacturing workshop and office areas, identify equipment contributing most to total energy use, and calculate savings potential through energy audit method. The research used descriptive quantitative approach by directly measuring electrical load, observing equipment operation hours, and applying load factor values. Total annual energy consumption based on manual calculation was 68,745.63 kWh/year, while RETScreen Expert simulation yielded 71,673 kWh/year (4.08% difference). Energy Consumption Intensity (ECI) based on total area of 2,272 m2 was 30.25 kWh/m2/year, classified as Very Efficient according to SNI 6196:2011 and ESDM Ministerial Regulation No. 13/2012. The highest energy consumers were welding transformer (22,680 kWh/year), compressor (17,280 kWh/year), and large blower (1,999.2 kWh/year). Energy savings recommendations include replacing conventional welding transformer with inverter based unit, substituting large blowers with more efficient axial fans, upgrading lighting to LED, and replacing conventional AC with inverter AC. Implementation of these recommendations can reduce energy consumption by 8,518.6 kWh/year (11.8%) and save costs of Rp 9,013,754/year. Carbon emissions before savings measures amounted to 59.81 ton CO 2/year, decreasing to 52.40 ton CO 2/year after implementation, a reduction of 7.41 ton CO 2/year (12.39%). Payback period of total investment (Rp 105,130,400) is approximately 6.9 years
Analysis of Energy Supply Substitution from a Diesel Power Plant System to a Solar Power Plant System Based on Capacity Design for the Office Load of PT XYZ in Karimun Regency, Indonesia Muhammad Iqbal; Andre Kurniawan; Arwizet K; Yolli Fernanda
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 3 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/cz0ekp13

Abstract

The dependence of the office load at PT XYZ on Diesel Power Plants (DPPs) in a mini-grid electricity system creates the need for an alternative energy supply that is more efficient, reliable, and compatible with local solar potential. The present study aims to design and analyze the performance of a battery-based off-grid Solar Photovoltaic Power Plant (SPP) to independently supply office electricity demand by considering the load profile, photovoltaic module configuration, controller/MPPT converter, battery capacity, module orientation, and system losses. The method consists of daily load profile analysis, the use of Meteonorm meteorological data for the Sungailimau site, fixed module orientation with a tilt angle of 5° and an azimuth of 0°, and stand-alone system simulation using PVsyst V8.1.2. The proposed system consists of 200 Longi Solar modules rated at 560 Wp, with a total installed capacity of 112 kWp, The solar power system is designed in a modular configuration consisting of 4 PV blocks. Each block consists of 5 strings connected in parallel, with each string comprising 10 PV modules connected in series. The total system configuration consists of 20 strings., an MPPT converter-based controller, and a BYD Box Premium HVM 22.1 lithium-ion LFP battery storage system with 368,6 kWh of stored energy. The simulation results show 105.989 kWh/year of useful solar energy, 151.191 kWh/year of available solar energy, 49.213 kWh/year of unused energy, a performance ratio of 56,64%, a solar fraction of approximately 92,33%, and 1.856 kWh/year missing energy. 
Actual Performance Analysis of a Rankine Back Pressure System on a 1600 kW Turbine-Generator Unit at PT Kencana Sawit Indonesia Using Python Programming Muhammad Bayu Septian; Arwizet K; Yolli Fernanda; Andre Kurniawan
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 3 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/x2phe139

Abstract

The Palm oil mills require steam systems that can supply electricity and process heat at the same time. This study analyzes the actual performance of a Rankine back pressure system on a 1600 kW turbine-generator unit at PT Kencana Sawit Indonesia using Python programming. The study used field documentation, equipment nameplate data, turbine-generator logsheet data, and an assumed steam flow scenario of 21.0-26.0 ton/h because the boiler steam flow indicator was reported to show an over-range condition. The analysis was carried out by converting actual operating data into thermodynamic performance parameters, including generator load, steam rate, turbine efficiency estimation, power-only efficiency, and energy utilization tendency. The results show that the unit operated under partial load with an average generator output of 715.19 kW or about 44.70% of the 1600 kW nominal capacity. The average steam rate increased from 32.99 kg/kWh at 21.0 ton/h to 40.85 kg/kWh at 26.0 ton/h. The estimated turbine efficiency decreased from 43.45% to 35.10% as the assumed steam flow increased. The power-only efficiency remained low because the exhaust steam was not discharged as waste heat, but was used as process steam in the back pressure system. Python-based processing provides a transparent and repeatable approach for evaluating field logsheet data.
Analysis of Building Electrical Energy Consumption and Energy Saving Potential Using e-Quest Simulation with the Energy Efficiency Measures Method Rano Hanif; Arwizet K; Yolli Fernanda; Andre Kurniawan
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 3 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pk0n4n16

Abstract

This study presents a preliminary electrical energy audit of the Health Office Building of West Sumatra Province, aiming to determine the building's Energy Consumption Intensity (ECI), map the distribution of electrical loads, and identify Energy Efficiency Measures (EEM) through e-Quest building energy simulation. A descriptive-quantitative method was applied following the SNI 6196:2011 energy audit procedure and the ECI standard of Ministerial Regulation of Energy and Mineral Resources (ESDM) No. 13 of 2012. Primary data were obtained from direct field measurement of voltage, current, and power factor using a watt meter across 22 rooms on two floors (1,360 m2), supplemented by 12 months of PLN electricity billing data as secondary data. Building simulation was performed in the e-Quest Quick Energy Simulation Tool using Activity Area, Lighting, and Plug Loads parameters derived from the field measurements. The manual calculation yielded a total consumption of 78,337.13 kWh/year, corresponding to an ECI of 57.60 kWh/m2/year, validated against PLN billing data with a deviation of only 5.00%, placing the building in the "Very Efficient" category (threshold < 102 kWh/m2/year). Air-conditioning (AC) dominates consumption at 89.21%, far exceeding other equipment (6.65%) and lighting (4.14%). The e-Quest model produced 88,640 kWh/year, deviating 7.76% from PLN data. Among three EEM scenarios tested, AC-inverter retrofit yielded the largest saving (37.20%), followed by AC set-point adjustment from 22°C to 23°C (5.08%), while LED lighting retrofit produced the smallest saving (1.47%). These findings indicate that energy-conservation priorities should be directed primarily toward the air-conditioning system.

Page 44 of 44 | Total Record : 437

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